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//
// CompareInfo.cs
//
// Authors:
// Marek Safar <marek.safar@gmail.com>
//
// Copyright (C) 2015 Xamarin Inc (http://www.xamarin.com)
//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
//
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//
// Disable unreachable code warnings in this entire file.
#pragma warning disable 162
using System.Collections.Generic;
using System.Runtime.CompilerServices;
using Mono.Globalization.Unicode;
using System.Threading;
namespace System.Globalization
{
interface ISimpleCollator
{
SortKey GetSortKey (string source, CompareOptions options);
int Compare (string s1, string s2);
int Compare (string s1, int idx1, int len1, string s2, int idx2, int len2, CompareOptions options);
bool IsPrefix (string src, string target, CompareOptions opt);
bool IsSuffix (string src, string target, CompareOptions opt);
int IndexOf (string s, string target, int start, int length, CompareOptions opt);
int IndexOf (string s, char target, int start, int length, CompareOptions opt);
int LastIndexOf (string s, string target, CompareOptions opt);
int LastIndexOf (string s, string target, int start, int length, CompareOptions opt);
int LastIndexOf (string s, char target, CompareOptions opt);
int LastIndexOf (string s, char target, int start, int length, CompareOptions opt);
}
partial class CompareInfo
{
[NonSerialized]
ISimpleCollator collator;
// Maps culture IDs to SimpleCollator objects
static Dictionary<string, ISimpleCollator> collators;
static bool managedCollation;
static bool managedCollationChecked;
#if WASM
const bool UseManagedCollation = false;
#else
static bool UseManagedCollation {
get {
if (!managedCollationChecked) {
managedCollation = Environment.internalGetEnvironmentVariable ("MONO_DISABLE_MANAGED_COLLATION") != "yes" && MSCompatUnicodeTable.IsReady;
managedCollationChecked = true;
}
return managedCollation;
}
}
#endif
ISimpleCollator GetCollator ()
{
#if WASM
return null;
#else
if (collator != null)
return collator;
if (collators == null) {
Interlocked.CompareExchange (ref collators, new Dictionary<string, ISimpleCollator> (StringComparer.Ordinal), null);
}
lock (collators) {
if (!collators.TryGetValue (_sortName, out collator)) {
collator = new SimpleCollator (CultureInfo.GetCultureInfo (m_name));
collators [_sortName] = collator;
}
}
return collator;
#endif
}
SortKey CreateSortKeyCore (string source, CompareOptions options)
{
if (UseManagedCollation)
return GetCollator ().GetSortKey (source, options);
return new SortKey (culture, source, options);
}
int internal_index_switch (string s1, int sindex, int count, string s2, CompareOptions opt, bool first)
{
// TODO: should not be needed, why is there specialization for OrdinalIgnore and not for Ordinal
if (opt == CompareOptions.Ordinal)
return first ? s1.IndexOfUnchecked (s2, sindex, count) : s1.LastIndexOfUnchecked (s2, sindex, count);
return UseManagedCollation ?
internal_index_managed (s1, sindex, count, s2, opt, first) :
internal_index (s1, sindex, count, s2, first);
}
int internal_compare_switch (string str1, int offset1, int length1, string str2, int offset2, int length2, CompareOptions options)
{
return UseManagedCollation ?
internal_compare_managed (str1, offset1, length1,
str2, offset2, length2, options) :
internal_compare (str1, offset1, length1,
str2, offset2, length2, options);
}
int internal_compare_managed (string str1, int offset1, int length1, string str2, int offset2, int length2, CompareOptions options)
{
return GetCollator ().Compare (str1, offset1, length1,
str2, offset2, length2, options);
}
int internal_index_managed (string s, int sindex, int count, char c, CompareOptions opt, bool first)
{
return first ?
GetCollator ().IndexOf (s, c, sindex, count, opt) :
GetCollator ().LastIndexOf (s, c, sindex, count, opt);
}
int internal_index_managed (string s1, int sindex, int count, string s2, CompareOptions opt, bool first)
{
return first ?
GetCollator ().IndexOf (s1, s2, sindex, count, opt) :
GetCollator ().LastIndexOf (s1, s2, sindex, count, opt);
}
[MethodImplAttribute (MethodImplOptions.InternalCall)]
private static unsafe extern int internal_compare_icall (char* str1, int length1,
char* str2, int length2, CompareOptions options);
private static unsafe int internal_compare (string str1, int offset1,
int length1, string str2, int offset2, int length2, CompareOptions options)
{
fixed (char* fixed_str1 = str1,
fixed_str2 = str2)
return internal_compare_icall (fixed_str1 + offset1, length1,
fixed_str2 + offset2, length2, options);
}
[MethodImplAttribute (MethodImplOptions.InternalCall)]
private static unsafe extern int internal_index_icall (char *source, int sindex,
int count, char *value, int value_length, bool first);
private static unsafe int internal_index (string source, int sindex,
int count, string value, bool first)
{
fixed (char* fixed_source = source,
fixed_value = value)
return internal_index_icall (fixed_source, sindex, count,
fixed_value, value?.Length ?? 0, first);
}
}
}
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